I'm going to sound cold saying this, but... your personal experience still doesn't really justify you defending Cavill here. Cavill is a successful Hollywood actor, which means that he has resources that most regular people don't: lawyers, publicists, and heck even PR firms that offer damage control for public faux pas. He's in a far more powerful position than most women he could choose to date.
You fretting over one possible accusation ruining his entire career is overblown.
I'm not dismissing that false accusations exist. I'm just saying that in the grand scheme of things, especially if we're talking about celebrities like Henry Cavill, they happen so rarely as to be arguably insignificant. Especially in the face of the many, many cases of sexual harassment that DO happen. Your own personal experiences with false accusations are much different than what happens to people in the public eye. Why in the world would someone want to make a false accusation against a major public figure when they know they'd be subject to just as much, if not more, scrutiny than the public figure?